Milkweed leafs
Illinois has caterpillars that include the brown hooded owlet moth and monarch butterfly. Other caterpillars that are found in Illinois include the Asteroid, white-marked tussock moth, yellow-marked tussock moth, milkweed tussock moth, and the viceroy caterpillar.
The accepted scientific name is Euchaetes egle.
They are a native insect that naturally feeds on milkweed plants. If by "bad" you mean are they an invasive or pest species, then no, they are not bad. Some people are allergic to their hairs though, so be careful with them...
Yes, the black and orange fuzzy caterpillar you may be referring to is likely a Milkweed Tussock Moth caterpillar.
The rusty tussock moth (Orgyia antiqua)
Torolf R. Torgersen has written: 'Identification of parasites of the Douglas-fir tussock moth, based on adults, cocoons, and puparia' -- subject(s): Identification, Parasitic insects, Douglas-fir tussock moth, Parasites 'Douglas-fir tussock moth handbook' -- subject(s): Control, Douglas-fir tussock moth
The name of the orange caterpillar with black spots commonly found in North America is the Milkweed Tussock Moth Caterpillar.
Tussock moth caterpillars are relatively toxic to other animals. If a dog ingests one, it could get very sick from the poison.
a tussock moth
Richard R Mason has written: 'Douglas-fir tussock moth handbook' -- subject(s): Larvae, Douglas fir tussock moth
1 week
It has a type of sex maniac poison